LOOKS LIKE THE ONLY WAY (TO ME) TO HAVE DIFFERENT PRESSURES ON A SYSTEM BEING PRESSURED IDENTICALLY IS FOR THE CALIPER PISTONS TO BE DIFFERENT DIAMETER

AS WITH ALL THE WAY AROUND DRUM BRAKES, EVERYTHING IS IDENTICAL EXCEPT THE BORE SIZES OF THE WHEEL CYLINDERS---LARGER ON THE FRONT BRAKES---SMALLER ON THE REAR BRAKES READ THE INFO ABOUT THE 2ND AND 3RD ITEMS IN THIS LINK

WHAT IF YOU DID CHANGE BOTH CALIPERS---THE LEFT ONE WAS MADE BY "LITTLE INDUSTRIES" AND THE RIGHT ONE WAS MADE BY "BIG INDUSTRIES"---AND LETS SAY THE PISTON SIZES ARE DIFFERENT----WILL YOU BE IN THE EXACT SAME SITUATION AS YOU ARE NOW???

IS THEIR A DIFFERENCE SOMEWHERE THRU THE LINE--OR THE YEARS---OR THE COUNTRIES IT'S SOLD TO??? THIS IS CAR IS THE SAME BASE AS A FORD CONTOUR AND A MERCURY MYSTIQUE

YOU HAVE ME WONDERING, AND YOU MAY HAVE STUMBLED ONTO A GLITCH NO ONE ELSE CAUGHT

BEING A PLUMBER---EVEN A RESTRICTED LINE IN A WATER SYSTEM WILL BUILD THE SAME PRESSURE---FLOW OR VOLUME WILL ONLY DIFFER---SO YOUR DILEMMA DOES MOT MAKE SENSE---UNLESS THERE IS A SIZE DIFFERENCE

No it's caused by sludge build up around the pistons, thats why calipers are replaced in pair, to AVOID this problem, which will cause uneven wear from side to side. Replace left caliper and retest your pressures.